Abstract
In order to utilize MgB2 wires in AC electrical devices, it is very important to be able to understand the characteristics of MgB2 materials in the AC electromagnetic conditions and give an accurate estimate of the AC loss. A numerical method is proposed in this paper to estimate the AC loss in MgB2 wires. This method is based on solving a set of partial differential equations in which the magnetic field is used as the unknowns to get the current and electric field distributions in the cross sections of the wires, and hence the AC loss can be calculated. A commercial FEM solver is used to give an easy and fast solution for many complex geometries. This method is used to model a monocore MgB2 wire and a multifilamentary MgB2 wire. The results demonstrate that the multifilamentary MgB2 wire has a lower AC loss than monocore one when carrying the same amount of current.
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